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. 2010 Jan 29;25(7):2178–2187. doi: 10.1093/ndt/gfp765

Stages of chronic kidney disease [16]

Stage Clinical GFR (ml/min)
1a Normal >90
2a Mild impairment 60–89
3 Moderate impairment 30–59
4 Severe impairment 15–29
5 End-stage renal failure <15